<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        男 <input type="radio" value='男' name='sex' v-model='sex'>
        女<input type="radio" value='女' name='sex' v-model='sex'>
        <button @click='info1'>点击查看选择状态</button>
    </div>


    <script>
   
        var app = new Vue({
            el: '#app',
            data: {
                message: 'Hello Vue22222!',
                checked:true,
                sex:'男'
            },
            methods:{
                change1() {
                    this.checked = !this.checked
                },
                btn1(){
                    alert(this.checked)
                },
                info1(){
                    alert(this.sex)
                }
            }
        })

        console.log('app', app)

    </script>
</body>

</html>